AMS4123 Datasheet | Advanced Monolithic Systems

Description The AMS4123 bines a 3A Step-Down converter with a 1A LDO in a single SO-8 exposed paddle package. Both the LDO and Step-Down converter are low ESR, ceramic capacitor output, stable. The Step-Down converter is internally pensated with internal soft-start to minimize the number of external ponents. An Enable pin provides built-in externally programmable power-up sequencing. The Step-Down converter enable threshold is 2.0V and the LDO enable threshold is 2.5V. It also has hiccup current limit and thermal protection. Thermal protection shuts down both the Step-Down converter and LDO when the die temperature exceeds 135°C. Both regulators are adjustable using a 0.6V reference for low output voltage settings. The LDO has options for fixed output voltages from 0.6V to 5V in 100m V steps. The LDO external input can be powered from the Step-Down converter output, for improved efficiency, or from any voltage source that is less than or equal to the device supply voltage (Vin). With a dropout voltage of less than 350m V at 1A, the AMS4123 LDO makes the perfect solution for a low noise 1.8V power source developed from 2.5V Step-Down converter output. The AMS4123 is a plete solution for LCD TV power requirements when bined with the AMS4122 (2A Dual Switching Regulator in SO-8). 3A 20V Step-Down Converter + 1A LDO Features - Step-Down Converter + LDO in SO-8EP - Internally pensated - Up to 95% Efficiency - Low ESR Ceramic Output Capacitor Stable - Soft Start - Under-Voltage Lockout - Dual Threshold Enable - 300 k Hz Switching Frequency - Hiccup Current Limit - Over-Temperature Shutdown - Ultra-Low Dropout LDO 350m V @ 1A - Up to 3A Step-Down Output Current - Up to 1A LDO Output Current - Excellent Light Load Efficiency Applications - Audio Power Amplifiers - Portable (Notebook) puters - Point of Regulation for High Performance Electronics - Consumer Electronics - DVD, Blue-ray DVD writers - LCD TVs and LCD monitors - Distributed Power Systems - Battery Chargers -...